Abstract:
Technological application of weather diagnosis and radar-measured precipitation was employed in analyzing the mountain flood disaster on September 2
nd 2018 in Malipo County, Yunnan Province, combined with some cases in Lijiang and Qujing Cities. The results show: ① The chief reasons causing that disaster were low vortex moving westward along the convergence zone between subtropical anticyclone and continental anticyclone, affected by the plateau mountainous terrain lifting effect, which further led to mesoscale cellular convection combination and local heavy rain. ② The analysis of radar data can provide a more comprehensive and detailed understanding of the cause of the disaster, precipitation distribution, heavy precipitation areas and distribution periods, and has a certain amount of advance compared with the measured precipitation on the ground. ③ The radar estimation of precipitation can make up for the precipitation data in the area without rain-observation. Some precipitation change law was obtained by employing radar to estimate precipitation, such as the particularity of distribution, the diversity of precipitation intensity affected by terrain, mesoscale cellular convection combination in stratified clouds causing heavy precipitation, application of high-mountain radar to predict precipitation as well as the limits and making-up measures of the application. These all are somewhat valuable in exploring the mechanism of how mountain torrents lead to mud and rock slides, and preventing and reducing disasters.